Automatic cleaning device for spark-plugs



W. 0. OUHSLER. AUTOMATIC CLEANING DEVICE FOR SPARK PLUGS. APPLICATION FILED OCT. 10, I919.

Patented June 15, 192%..

NrrEo STATES Pa EnT OFFICE;

WILLIAM CERIL OURSLER, OF MEMPHIS, TENNESSEE, ASSIGNOR TO SAM RICE OURSLER. OF MEMPHIS, TENNESSEE.

A'U'IOIvlTA'IIG CLEANING DEVICE FOR SPARK-PLUGS.

eanna.

Specification of Letters Patent.

Patented June 15, 1920.

. To all whom it may concern:

Be it known that I. lVuaaau Claim. ()UnsLnn, a citizen of the l nited States, residing at Memphis, in the county of Shelby and j the State of Tennessee, have iuvented certam new and-useful Improvements in Automatic Cleaning Devices for Spark-Plugs, of which the following is a specification.

This invention relates to means for automatically keeping the porcelain portions of spark plugs free from deposits of products of combustion.

The invention may be applied to different types-of plugs but is shown as applied to a spark plug now .on' the market.

The invention consists in the novel features of construction hereinafter described, pointed out in the claims. and shown in the accompanying drawings. in which Figure l is a side elevation. partly broken away, a portion'of the wall being in section.

and cleaning disks being shown in normal position in full lines and in raised position in dotted lines.

Fig. 2 is a section on the line 2-2 of Fig. 1.

In the drawing 1 represents a spark plug as a whole having a shell 2, and porcelain portion 3, and sparking points -l. Fitting loosely upon the portion 3 and slidable thereon and within the shell are flat disks One, two or more of these may be employed, and I have illustrated the device as having two disks. It will be noted that these disks are of such diameter that the distance between them and the shell is slightly greater than the spark gap between the points -l and the shell 2'. This is to prevent danger of sparking between the disks and the shell.

Normally there is an equal pressure on both faces of the disks when the compressed gases are ignited. The explosion, however,

' takes place below the disks, thereby creating a greater pressure beneath the disks than exists above them. To equalize this pressure the gases will push )ast the disks and upwardly into the shell, and the pressure being greater on the underside the disks will be lifted, but as the pressure equalizes this lifting movement will be checked, and the gases passing the rings will act as a cushion, preventing danger of the disks being wedged on the 11 )per portion of the porcelain portion hen the exhaust takes "place the operation will be reversed, the ressure fall. ing on the under faces of the c isks, andtlie disks will fall. to normal position both by reason of gravity and downward movement of the gases. This cycle is repeated with each explosion, and it will be obvious that as the rings move up and down on the portion 3 of the plug they will effectually prevent the accinnulation of any deposit thereon.

'hat I claim is 1. In a spark plug having a shell, a portion of insulating material arranged within said shell, a point carried by said portion spaced from the shell. said space forming a spark gap, and a disk working loosely upon said portion of insulating material, the distance between said disk and the shell being greater than the width of the spark gap,

said disk being movable upwardly by gaspressure. t

2. The combination with a spark plug having a shell, a porcelain portion within the shell and a spark gap at thelower end of the shell. a flat disk loosely movable upon the porcelain portion and spaced from the shell, said disk being lifted upwardly by force of the explosion takin place below it. In testimony whereof I a 'x 111 Si nature.

' WILLIAM GERIL OIT RS ER. 

